package com.cy.filter;

import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

public class AuthGlobalFilter implements GlobalFilter, Ordered {
    /**
     * @param exchange 网关交换器
     * @param chain    过滤链(包含多个过滤器)
     * @return Mono 代表spring webflux技术中的0个或1个响应序列
     */
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        ServerHttpRequest request = exchange.getRequest();
        ServerHttpResponse response = exchange.getResponse();

        String username = request.getQueryParams().getFirst("username");
        if (!"admin".equals(username)) {
            System.out.println("认证失败");
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            //终止请求
            return exchange.getResponse().setComplete();
        }
        //继续传递
        return chain.filter(exchange);
    }

    @Override
    public int getOrder() {
        return -200;
    }
}
